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Goodwill and Intangible Assets - Estimated Future Amortization Costs (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 (remainder) $ 156,233  
2022 624,931  
2023 624,931  
2024 624,931  
2025 624,931  
Thereafter 4,471,903  
Total $ 7,127,860 $ 2,195,051